Statewise lockdown relaxation dates

Currently the plots show vertical lines corresponding to national lockdown relaxation dates. As such, some states may have different relaxation dates due to differing local epidemic situations, which will affect the accuracy of the temporal relation between indicators and lockdown events.

1. Volunteers who can provide the dates of lockdown relaxation events in their respective states.
2. Dates of lockdown relaxation would then become variables for each state rather than nationally uniform as of now. This has to be reflected in statewide dataset (backend), and the website plots need to pick these dates from the json to show the state's vertical lines (frontend).

The issue identifies the statewide dataset in the backend, the JSON consumed by plots, and the website frontend as the entry points. Start by tracing how national relaxation dates are stored and read for vertical lines, then compare the backend data shape with the frontend plot input. Done means state-specific dates are represented in the dataset and the corresponding state plots use them; no files or tests are named.

Written by the indexing model from the issue text.